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Search Results: 1 - 10 of 5818 matches for " Zenita Cunha;Rondini "
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Capacidade, dota??o, talento, habilidades: uma sondagem da conceitua??o pelo ideário dos educadores
Guenther, Zenita Cunha;Rondini, Carina Alexandra;
Educa??o em Revista , 2012, DOI: 10.1590/S0102-46982012000100011
Abstract: the present study, while arising from a theoretical basis, is nonetheless, an exploratory study that attempts to identify the basic concepts of special education for is gifted and talented students of brazil. the definitions and notions understood by the subjects, all professionals in the field of education, are captured by probing them, about their opinions on which terms and expressions are commonly used, with which meanings, and in which specific settings. the sample is comprised of 80 educators studying or involved within the area, (group a), and 107 regular school teachers from a state school system in s?o paulo state (group b). very few differences of opinion are registered between the two groups, save a few exceptions, mainly in relation to a knowledge of, and familiarity with, the theoretical framework. both groups indicate conceptual confusion, in particular with the following official terms: super-giftedness and highly-skilled, with the largest rejection load (erroneous understanding) and also the highest media exploitation being allocated to the term, super-gifted. the concepts high ability, high performance and giftedness are defined according to the theoretical framework which differentiates natural ability from acquired ability; the word talent reflects the ambiguity encountered in the area, being referred to, at the same time, as natural ability and also as acquired ability.
Utility of N-Bromosuccinimide for the Titrimetric and Spectrophotometric Determination of Famotidine in Pharmaceutical Formulations
O. Zenita,K. Basavaiah
International Journal of Analytical Chemistry , 2011, DOI: 10.1155/2011/581372
Abstract: Two titrimetric and two spectrophotometric methods are described for the assay of famotidine (FMT) in tablets using N-bromosuccinimide (NBS). The first titrimetric method is direct in which FMT is titrated directly with NBS in HCl medium using methyl orange as indicator (method A). The remaining three methods are indirect in which the unreacted NBS is determined after the complete reaction between FMT and NBS by iodometric back titration (method B) or by reacting with a fixed amount of either indigo carmine (method C) or neutral red (method D). The method A and method B are applicable over the range of 2–9?mg and 1–7?mg, respectively. In spectrophotometric methods, Beer's law is obeyed over the concentration ranges of 0.75–6.0? g? (method C) and 0.3–3.0? g? (method D). The applicability of the developed methods was demonstrated by the determination of FMT in pure drug as well as in tablets. 1. Introduction Famotidine (FMT), 3-[2-(diaminomethyleneamino)thiazol-4-ylmethylthio]-N-sulfamoylpropionamidine (Figure 1), is a histamine H2-receptor antagonist (H2-RA). It is widely used for the treatment of duodenal ulcers, benign gastric ulcer, reflux oesophagitis, and hyperacid secretory conditions. FMT is official in both the British Pharmacopoeia (BP) [1] and the United States Pharmacopoeia (USP) [2]. The BP [1] recommends thin-layer chromatography using a silica gel F254 precoated plate (Fischer Silica Gel GF plates are suitable) and a mixture of 2 volumes of 13.5?M ammonia, 20 volumes of toluene, 25 volumes of methanol, and 40 volumes of ethyl acetate as the mobile phase. The USP [2] recommends a potentiometric nonaqueous method for the determination of FMT using perchloric acid as the titrant and a HPLC method using a mixture of acetate buffer of pH 6?:?acetonitrile (93?:?7) as a mobile phase with UV detection at 275?nm. Figure 1: Structure of famotidine. Several procedures have been reported in the literature for the analysis of FMT. The reported methods include HPLC [3–5], HPTLC [6, 7], capillary electrophoresis [8], potentiometry [9], differential pulse voltammetry [10], spectrofluorimetry [11, 12], polarography [13], and UV-spectrophotometry [14]. Some of these methods involve several manipulation steps, which are not simple for routine analysis of pharmaceutical formulations and need sophisticated instruments. Titrimetry and visible spectrophotometry may serve as useful alternatives to many of the aforesaid sophisticated techniques because of their cost effectiveness, ease of operation, sensitivity, remarkable accuracy and precision, and wide
Spectrophotometric determination of famotidine using sulphonphthalein dyes
Basavaiah, Kanakapura;Zenita, Okram;
Química Nova , 2011, DOI: 10.1590/S0100-40422011000500002
Abstract: four new extraction-free spectrophotometric methods have been established for the quantitation of famotidine (fmt). the methods are based on the formation of yellow ion-pair complexes between fmt and four sulphonphthalein dyes viz., bromothymol blue (method a), bromophenol blue (method b), bromocresol purple (method c) and bromocresol green (method d) in dioxane or acetone medium. the experimental variables such as reagent concentration, solvent medium and reaction time have been carefully optimized to achieve the highest sensitivity. the proposed methods were applied successfully to the determination of famotidine in tablets with good accuracy and precision and without interferences from common excipients. the results obtained by the proposed methods were compared favorably with those of the reference method.
Dota o e talento: reconhecimento e identifica o
Zenita C. Guenther
Revista Educa??o Especial , 2006,
Abstract: O presente artigo exp e uma vis o geral do conhecimento existente sobre reconhecimento e localiza o de potencial, dota o e talento em escolares, como introdu o à discuss o da metodologia de identifica o desenvolvida para o Centro para Desenvolvimento do Potencial e Talento, CEDET, de Lavras, MG, por Guenther. Segue-se um detalhamento dos pontos básicos dessa metodologia, partindo do referencial teórico, instrumental e processamento de dados colhidos nas escolas regulares, e terminando com uma síntese do estudo para valida o cientifica, conduzido pela autora e equipe em 1997, em convênio UFLA - FAPEMIG - CEDET. Palavras-chave: Identifica o de Talentos. Dota o. Superdota o. CEDET.
Centros comunitários para desenvolvimento de talentos - O CEDET
Zenita C. Guenther
Revista Educa??o Especial , 2007,
Abstract: O Centro para Desenvolvimento do Potencial e Talento, CEDET, (Guenther, 2002 - 2006) desenvolve um programa educacional para estudantes dotados e talentosos integrado ao sistema escolar, que visa diminuir a distancia entre o que se sabe, pelos resultados de estudos científicos e o que se faz, nessa área, no trabalho educacional com crian as e jovens. A metodologia de identifica o caracteriza-se pela busca sistemática dos alunos dotados na popula o escolar, sem esperar que sejam "indicados". A organiza o pedagógica apóia-se em um referencial teórico construído com bases no pensamento humanista, contemplando as dimens es básicas à forma o da personalidade: auto-conceito; conceito do outro; e vis o de mundo. Sua dinamica de a o envolve estabelecer uma rede de influência em que a família, a comunidade, a escola s o chamadas a participar no processo educativo de cada crian a, em diferentes momentos. O processo de estimula o do domínio de capacidade identificado é regido por um Plano Individual de Trabalho feito semestralmente pela crian a junto com o seu orientador, seguindo dois eixos de objetivos: desenvolver a capacidade natural e talento sinalizado, e aperfei oar aspectos da forma o pessoal. Em três momentos distintos de avalia o processual, (Guenther, 1996, 2002) verifica-se que os resultados alcan ados respondem aos objetivos, e indicam coerência com o referencial teórico adotado. Palavras-chave: Dota o. Superdotados. Talento.
Acelera o, ritmo de produ o e trajetória escolar: desenvolvendo o talento acadêmico
Zenita C. Guenther
Revista Educa??o Especial , 2009, DOI: 10.5902/1984686x810
Abstract: A distribui o da escolaridade em anos letivos, sequencialmente trancados entre si, cria condi es de aprendizagem e convivência nefastas aos alunos cuja capacidade e produ o mental é superior à média dos pares etários. Acelera o é um meio utilizado para permitir que esses alunos avancem com currículo em menos tempo que o previsto pelos documentos legais, e possam caminhar pela seria o escolar, independente da idade mínima estabelecida pelos sistemas. A grande perplexidade é que, mesmo sendo um dos temas mais estudados pela área da Educa o, e da Educa o Especial para dotados e talentosos, os resultados da pesquisa científica n o têm tido qualquer impacto na prática educativa, permanecendo férrea resistência a essa medida, nos meios escolares. O presente artigo discute a temática da acelera o vista como meio para desenvolver o talento acadêmico, também a express o da inteligência, com domínio de capacidade, que tem sido mais e talvez melhor estudada, na área de dota o e talento. Palavras-chave: Acelera o. Ritmo. Trajetória escolar.
Knowledge, attitude and practices study on reproductive health among secondary school students in Bolgatanga, Upper East Region, Ghana
S Rondini, JK Krugu
African Journal of Reproductive Health , 2009,
Abstract: This study was conducted within the secondary school student population of the Bolgatanga community, in Northern Ghana, to learn about knowledge, attitude and practices of reproductive health of this adolescent student population. Both quantitative and qualitative data were collected on adolescence perception, STIs and HIV/AIDS, family planning, male-female relationship, and vulnerability to sexual violence. The data collected show a concerning low familiarity of the student population with family planning methods and HIV/AIDS transmission, which, combined with minimal contraceptive use, pose them at high risk for unwanted pregnancies and sexual infections transmission. We argue that poor infrastructures and low accessibility of these rural areas in Northern Ghana may have led to uneven distribution of reproductive health educational programs in the country, urging more programs and interventions aimed particularly at these high risk groups (Afr J Reprod Health 2009; 13[4]:51-66).
Application of Oxidizing Properties of Permanganate to the Determination of Famotidine in Pharmaceutical Formulations
Basavaiah, Kanakapura;Zenita Devi, Okram;
Journal of the Mexican Chemical Society , 2010,
Abstract: one titrimetric and two spectrophotometric methods are described for the determination of famotidine (fmt) in either pure form or in its pharmaceutical formulations. the methods are based on redox reaction between fmt and kmno4 in acid and alkaline media. in titrimetry, an acidified solution of fmt is titrated directly with permanganate. direct spectrophotometry (method a) involves treating the alkaline solution of the drug with permanganate and measuring the bluish green product at 610 nm. in indirect spectrophotometry (method .), the drug solution is treated with a fixed concentration of permanganate in h2so4 medium, and after a specified time, the unreacted permanganate is measured at 545 nm. the molar combining ratio in titrimetry and the optimum assay conditions are studied. titrimetry is applicable over 1-10 mg range and the calculations are based on a 1:3 (fmt: kmno4) molar-ratio. in spectrophotometry, beer's law is obeyed over 0.75-7.5 and 2.5-20 μg ml-1 for method a and method ., respectively. the molar absorptivity values are calculated to be 2.79 × 104 and 1.62 × 104 l mol-1 cm-1 for method a and method b, respectively, and the corresponding sandell sensitivity values are 0.012 and 0.021 μg cm-2. the limits of detection (lod) and quantification (loq) are also reported for the spectrophotometric methods. the applicability of the developed methods was demonstrated by the determination of fmt in pure drug as well as in commercial dosage forms.
Application of Oxidizing Properties of Permanganate to the Determination of Famotidine in Pharmaceutical Formulations
Kanakapura Basavaiah,Okram Zenita Devi
Revista de la Sociedad Química de México , 2010,
Abstract: Se describen tres metodos, uno de titulacion y dos espectrofotometricos, para la determinacion de famotidina (FMT) en su forma pura o en sus formulaciones farmaceuticas. Los metodos estan basados en la reaccion redox entre FMT y KMnO4 en medios acido y basico. En el metodo de titulacion, una solucion acidificada de FMT se titula directamente con permanganato de potasio. De los metodos espectrofotometricos, el metodo directo A consiste del tratamiento de la solucion alcalina de la droga con KMnO4 y medicion del producto verde azulado a 610 nm. En el metodo indirecto B, la solucion de la druga se trata con una solucion fija de KMnO4 en acido sulfurico y, despues de un tiempo especifico, el KMnO4 que no reacciono se mide a 545 nm. Se estudio la proporcion molar en el metodo de titulacion, a fin de establecer las condiciones optimas. Asi, este metodo es aplicable en el intervalo de 1-10 mg, y los calculos se basan en una proporcion molar de FMT/KMnO4 (1:3). En los metodos espectrofotometricos A y B, la Ley de Beer se cumple en los intervalos de 0.75- 7.5 y 2.5-20 microg mL-1, respectivamente. Los valores de absortividad molar se determinaron como 2.79 x 104 y 1.62 x 104 L mol-1 cm-1 para los metodos A y B, respectivamente, y los valores correspondientes de sensibilidad fueron 0.012 and 0.021 microg cm-2. Se describen igualmente los limites de deteccion (LOD) y cuantificacion (LOQ) para los metodos espectrofotometricos. La aplicacion de los metodos desarrollados se demostro en la determinacion de FMT en su forma pura, asi como en su forma de dosis comerciales.
SENSITIVE AND SELECTIVE EXTRACTION FREE ION-PAIR COMPLEXOMETRIC DETERMINATION OF DOMPERIDONE IN PHARMACEUTICALS AND IN SPIKED HUMAN URINE
ZENITA,O; BASAVAIAH,K; VINAY,K B;
Journal of the Chilean Chemical Society , 2011, DOI: 10.4067/S0717-97072011000200021
Abstract: domperidone (dom) is a drug used as an antiemetic and to control gastrointestinal effects of dopaminergic drugs in the management of perkinsonism. two simple, rapid, sensitive and selective extraction free spectrophotometric methods have been developed for the assay of dom in pure drug, in pharmaceuticals and in spiked human urine sample. the methods are based on the formation of yellow ion-pair complexes between dom and two sulphonphthalein dyes viz., thymol blue (method a) and bromothymol blue (method b) in acetone and dichloromethane medium. the complexes showed absorption maxima at 390 nm and 410 nm in method a and method b, respectively. reaction conditions were optimized to obtain the maximum color intensity. the absorbance was found to increase linearly with increase in concentration of dom, which was corroborated by the calculated correlation values of 0.9991 in method a and 0.9986 in method b. the systems obeyed beer's law over the concentration range of 1.25 - 20 μg ml-1 in both the methods. the molar absorptivity values are calculated to be 1.53 x 104 and 2.06 x 104 l mol1 cm1 for method a and method b, respectively and the corresponding sandell sensitivity values are 0.028 and 0.021 μg cm2. the composition of the ion-pairs was found to be 1 : 1 by job's method and the conditional stability constant (kf) of the complexes have been calculated. the proposed methods were applied successfully to the determination of dom in tablets as well as in spiked urine sample with good accuracy and precision.
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